curl --request GET \
  --url https://api-m.sandbox.paypal.com/v2/invoicing/accounting-sync/invoices/{id}/connections \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "connection_status": [
    {
      "connections": [
        {
          "platform_name": "<string>",
          "last_sync_time": "<string>",
          "last_sync_status": "IN_PROGRESS"
        }
      ]
    }
  ]
}